TW202146981A - Spectacle lens - Google Patents

Abstract

Provided are a spectacle lens and technology related thereto. This spectacle lens is provided with: a base region where a light flux entering from a surface on the object side is emitted from a surface on the eyeball side and converged through an eye at a position A on a retina; and a plurality of defocus regions brought into contact with the base region and having characteristics in which the light flux passing through at least some of the defocus regions enters the position A as divergent light. In the defocus regions, refracting power increases in a direction from the center toward the peripheral part.

Description

spectacle lenses

The present invention relates to a spectacle lens.

As an spectacle lens for suppressing the progression of refractive abnormalities such as myopia, there is a convex surface, which is a surface on the object side, formed with a plurality of convex regions having a curved surface different from the convex surface and protruding from the convex surface (for example, refer to Patent Document 1). ). According to the spectacle lens with this configuration, the light beams incident from the surface on the object side and exiting from the surface on the eyeball side are, in principle, focused on the wearer's retina, but the light beams passing through the convex region are more concentrated than on the retina. Focusing on the position on the object side prevents the progression of myopia. [Prior Art Literature] [Patent Literature]

[Patent Document 1] US Application Publication No. 2017/0131567

(The problem that the invention intends to solve)

The invention described in Patent Document 1 suppresses the progression of myopia by condensing the light beams passing through the plurality of convex regions, which are the second refraction regions, on the near-anterior side of the retina. The inventors of the present invention conducted a further study on the mechanism by which the invention described in Patent Document 1 exhibits the effect of suppressing the progression of myopia.

In order to understand the mechanism of myopia progression, understanding the mechanism that inhibits myopia progression is a shortcut.

The mechanism of myopia deepening is the so-called adjustment lag theory. When looking closely, originally the eyeball should exert the established accommodation power, but in fact there is a situation where the accommodation power exerted by the eyeball is insufficient. The amount of this lack of adjustment power is called adjustment lag.

In the presence of accommodation lag, a state occurs in which an image formed by the convergence of light beams passing through the eyeball (specifically, the pupil) is present on the inside of the retina. This state promotes the elongation of the axial length of the eye (eyeball growth), which increases myopia. This hypothesis is called the adjustment lag theory.

However, there is no sensor in the eye that directly detects whether the image is present in the inner side of the retina or in the near front side. On the other hand, according to the accommodation lag theory, there should be some structure in the human body that detects the image changes on the retina.

One possibility of this structure is presumed to be to detect changes in the image caused by adjustment fretting.

For example, in the case where the image exists inside the retina, the light beam from the object is incident on the retina as a convergent light beam. If the accommodative power of the lens in the eyeball is weak (the ciliary body relaxes and the lens becomes thinner), the image moves inward and the spot size on the retina becomes larger. Conversely, if the accommodation is stronger (contraction of the ciliary body and thickening of the lens), the spot size on the retina becomes smaller. It is generally believed that there is the following structure of myopia deepening, that is, by using the information processing of the optic nerve or the subsequent cortex to detect the change in the spot size caused by the adjustment of the micro-movement, and to send out a signal to promote the growth of the eyeball, it promotes myopia deepening.

The "spot" in this specification refers to the image formed on the retina after the light of the object point passes through a part of the spectacle lens and then passes through the optical system of the eyeball. When the focus is in focus, it becomes a point. ) becomes a distribution of light with size.

As another possibility to detect the image changing structure on the retina, the detection of the light intensity of the light spot can be exemplified.

When the irradiated light quantity is fixed, the smaller the area of the light spot, the greater the light quantity density. If the accommodating power of the lens in the eyeball is weak, the image will move inward, and the light intensity of the retinal spot will become lower. Conversely, if the adjustment becomes stronger, the light quantity density of the retinal spot becomes higher. It is generally believed that there is the following structure of myopia deepening: by using the information processing of the optic nerve or the subsequent cortex to detect the changes in the light intensity of the light spot caused by the adjustment of the micro-movement, it sends a signal to promote the growth of the eyeball, and promotes the deepening of myopia.

Regardless of the structure, as the mechanism of the invention described in Patent Document 1, the perception of the size change (or light intensity change) of the light spot on the retina caused by the accommodative micro-movement of the eyeball is used to suppress the progression of myopia. That is, it is generally considered that the greater the amount of change in the size of the light spot or the amount of change in the light intensity density of a predetermined eyeball accommodation amount, the stronger the effect of suppressing the progression of myopia (viewpoint 1).

As exemplified by the above-mentioned adjustment fretting, when the image exists inside the retina, the light beam from the object is incident on the retina in the form of a convergent light beam. The wavefront of light formed by the condensing beam is called the converging wavefront. That is, according to the above-mentioned adjustment hysteresis theory, when the wavefront incident on the retina is a convergent wavefront, the myopia is deepened.

In this case, conversely, the progression of myopia can be suppressed according to the condition that the diverging wave surface is incident on the retina (viewpoint 2). In fact, in Patent Document 1, a second refraction area is provided in the spectacle lens, and the light beam passing through the second refraction area is focused on the near front side of the retina, which is different from the focal point at which the light beam passing through the first refraction area converges. The so-called light beam passing through the second refraction region is converged on the near-anterior side of the retina, which means that the diverging wave surface is incident on the retina.

Based on the above-mentioned viewpoints 1 and 2, the divergence of the divergent beam can be increased in order to increase the variation of the spot size (or light intensity density) of a predetermined eye accommodation amount by making the divergent beam incident on the retina. Myopia deepening effect.

In order to increase the degree of divergence of the diverging light beam, the size (eg, diameter) or refractive power (power) of the so-called convex region in Patent Document 1 may be increased.

On the other hand, as the size of the convex region increases, the area occupied by the so-called first refraction region in Patent Document 1 (the base region for realizing the prescription power) decreases accordingly. This can lead to poor wearing feeling of the spectacle lenses.

An object of an embodiment of the present invention is to provide a technology that can improve the effect of suppressing the progression of myopia while maintaining the wearing feeling of the spectacle lens. (Technical means to solve problems)

The inventors of the present invention have made intensive studies in order to solve the above-mentioned problems. The following is a description of his experience with this study.

The prescription eyeglass lens and the eyeball are combined as an optical system. Among the incident light beams from objects at infinity, the light beams passing through the base region are concentrated at position A on the retina. Among the incident light beams, the light beam passing through the convex region is used as divergent light, and is incident on position A on the retina to form a light spot on the retina. Furthermore, the convex area (in a broader sense, called the defocus area; the details will be described below) includes the following two cases, one refers to the part of the protrusion on the surface of the lens, and the other case is even if there is no protrusion on the surface , and the light beam is incident on position A on the retina as divergent light, and a light spot is formed on the retina.

Fig. 1 is a schematic diagram showing the situation where the incident light beam from an object at infinity passes through a convex area of the spectacle lens and is incident on the retina when the eyeglass lens and the eyeball are combined as one optical system side view.

Assuming that the refractive power [unit: D] of the optical system combining the prescription spectacle lens and the eyeball is set as P _eye , the focal distance is f _eye =1/P _eye . On this basis, it is assumed that the convex area is a circular area in plan view and has a rotationally symmetrical shape, and the declination angle at point B _{, which is separated from the center of the circular area by a degree corresponding to h 0 [} Unit: radian] (hereinafter also referred to as "declination angle") is set to δ _{0 , then the height h 1} on the image plane of the light beam incident on the retina through point B on the convex region, regardless of the proximity of the aberration Under the axial calculation (paraxial approximation), it is as shown in the following [Equation 1]. As shown in FIG. 1 , the so-called _{larger h 1} means that the light spot on the retina is larger, and that the divergence of the diverging light beam is larger. [Formula 1]

That is, the _{larger the declination angle δ 0} is, the larger the absolute value of _{the height h 1 is.} When at least a part of the convex region has a variation in refractive power, that is, when at least a part of the convex region has an aspherical shape, the above-mentioned off-angle δ ₀ is not a fixed value. In this case, the maximum value _{of the deflection angle δ 0} brought about by the convex region _{(ie δ 0max} ) determines the radius of the light spot on the retina. In order to increase δ _0max , it is effective to increase the degree of defocusing from the position A on the retina to the near-anterior side, so it is effective to increase the refractive power.

Based on the content of the above investigation, the inventors of the present invention have made intensive studies on the convex region, adopted the expression of the defocus region as a concept including the convex region, and came up with the following aspects. A first aspect of the present invention is a spectacle lens comprising: a base region at which light beams incident from the surface on the object side are emitted from the surface on the side of the eyeball to converge on the retina through the eye at a position A; and a plurality of The defocused area, which is in contact with the above-mentioned base area, has the property of making the light beam passing through at least a part of the above-mentioned defocused area incident on the position A as divergent light; and in at least a part of the above-mentioned defocused area, the refractive power is along the The central portion increases toward the peripheral portion.

The second aspect of the present invention is the aspect described in the first aspect, wherein the light that passes through the defocus region and is emitted from the spectacle lens is in the same state as the light that passes through the imaginary lens, and the imaginary lens is opposite to It is formed by adding positive spherical aberration to a spherical lens having the same focal distance as the central part of the above-mentioned defocusing area.

The third aspect of the present invention is the aspect described in the first or second aspect, wherein the maximum light intensity density of the light spot when incident on the position A as the divergent light is, compared with the position A, at the position A It is larger at a position closer to the object side.

A fourth aspect of the present invention is the aspect described in any one of the first to third aspects, wherein the refractive power of the central portion of the defocus region is greater than the refractive power of the base region.

A fifth aspect of the present invention is the aspect described in any one of the first to fourth aspects, wherein the spectacle lens is a lens for suppressing progression of myopia.

Other aspects of the invention that can be combined with the above-described aspects are described below.

The defocused area is a convex area.

As an example of the arrangement of the convex regions in plan view, the centers of the convex regions are arranged independently of each other such that the centers of the convex regions become the vertices of an equilateral triangle (the centers of the convex regions are arranged at the vertices of the honeycomb structure).

When the refractive power is increased in the direction from the central portion to the peripheral portion, the refractive power can be increased from the top-view center of the convex region to the peripheral portion (root portion), or at a place other than the center (that is, away from the center by a predetermined distance) place) to increase the refractive power. Also, the increasing aspect may or may not be monotonically increasing. The amount of increase of the refractive power is not limited, and for example, it may be in the range of 1.0 to 8.0 D, and the refractive power may be increased to 1.1 to 3.0 times the refractive power of the central portion.

The diameter of the convex region is preferably about 0.6 to 2.0 mm. The protrusion height (protrusion amount) of the convex region is about 0.1 to 10 μm, preferably about 0.7 to 0.9 μm. The refractive power of the central portion of the convex region is appropriately set to be larger than the refractive power of the region where the convex region is not formed, and the difference is about 2.00 to 5.00 diopters. The portion of the peripheral portion of the convex region having the largest refractive power is appropriately set to be larger than the refractive power of the region where the convex region is not formed, and the difference is about 3.50 to 20 diopters. (Compared to the efficacy of the prior art)

According to an embodiment of the present invention, it is to provide a technology that can improve the effect of suppressing the progression of myopia while maintaining the wearing feeling of spectacle lenses.

Hereinafter, embodiments of the present invention will be described. The following description of the drawings is merely illustrative, and the present invention is not limited to the illustrative aspects. All the contents not described in this specification are described in Patent Document 1, and all the contents not described in Patent Document 1 (especially the contents concerning the production method) are described in WO2020/004551. When there is a conflict between the contents of Patent Document 1 and the contents of the gazette, the contents of the gazette shall take precedence.

The spectacle lens exemplified in this specification has an object side surface and an eyeball side surface. "Object-side surface" refers to the surface on the object side when the glasses with spectacle lenses are worn by the wearer. on the surface of the eyeball side. This relationship also applies to the lens substrates that form the basis of spectacle lenses. That is, the lens base material also has an object-side surface and an eyeball-side surface.

＜Glasses lens＞ The spectacle lens of one aspect of this invention is as follows. "An spectacle lens having: a base region that causes light beams incident from the surface on the object side to exit from the surface on the eyeball side to converge through the eye at a position A on the retina; and a plurality of defocused regions, which are in contact with the above-mentioned base region, and have the property of making the light beam passing through at least a part of the above-mentioned defocused regions incident on the position A as divergent light; and In at least a part of the above-mentioned defocused area, the refractive power increases in the direction from the central portion toward the peripheral portion. "

The base region refers to a portion that can realize the shape of the wearer's prescription, and corresponds to the first refraction region of Patent Document 1.

The defocused area refers to an area at least a part of which does not condense light at the condensing position using the base area. The convex region of one aspect of the present invention is included in the defocused region. The convex region refers to a portion corresponding to the minute convex portion of Patent Document 1. FIG. Like the spectacle lens described in Patent Document 1, the spectacle lens according to one aspect of the present invention is a lens that suppresses progression of myopia. Similar to the micro-convex portion of Patent Document 1, the plurality of convex regions in one aspect of the present invention may be formed on at least one of the object-side surface and the eyeball-side surface of the spectacle lens. In this specification, the case where a plurality of convex regions are provided only on the object side surface of the spectacle lens is mainly exemplified.

The defocusing power exerted by the defocused area refers to the difference between the refractive power of each defocused area and the refractive power of the part other than each defocused area. In other words, "defocusing power" refers to the difference obtained by subtracting the refractive power of the base portion from the average value of the minimum refractive power and the maximum refractive power of a given portion of the defocused area.

The convex region of one aspect of the present invention has the property that the light beam passing through at least a part of the convex region is incident on the position A on the retina as divergent light. "Divergent light" refers to the divergent light beam (light beam having a divergent wavefront) described in the column of the problem to be solved by the present invention. It can be either the position A where the light beam is incident on the retina as divergent light no matter which part of the convex region the light beam passes through, or the position A where the light beam is incident on the retina as divergent light when the light beam passes through a part of the convex region. Location A.

Furthermore, in the convex region, the refractive power is increased in the direction from the central portion toward the peripheral portion. As described in the column of means, in order to increase δ _0max , it is effective to increase the refractive power in the convex region. Furthermore, in one aspect of the present invention, in order to solve the problem of the present invention while freely designing the shape of the convex region, a configuration is adopted in which the refractive power increases in the direction from the central portion toward the peripheral portion.

"Refractive power" in this specification refers to the average value of the refractive power in the direction a with the smallest refractive power and the refractive power in the direction b with the largest refractive power (the direction perpendicular to the direction a), that is, the average refractive power. The refractive power of the central portion, for example, when the convex region is a spherical segment as in one aspect of the present invention, refers to the refractive power of the vertex at the center in plan view.

In addition, the center part means the top view center (or center of gravity; the description of the center of gravity is abbreviate|omitted) of a convex area or the part in the vicinity. Hereinafter, the description of "plan view" is abbreviate|omitted about the convex-shaped area|region, and means the plan view shape in the case where there is no special description. The peripheral portion refers to a portion in the vicinity of the boundary between the convex region and the base region (the root of the convex region). That is, the closer to the root portion of the convex region of one aspect of the present invention, the greater the curvature of the convex region. Thereby, δ _0max can be increased.

In this specification, the "direction from the central portion toward the peripheral portion" refers to the direction from the top-view center of the convex region toward the root portion, that is, the radial direction.

By adopting each of the above configurations, even without increasing the size of the convex region, the divergent light beam can be incident on the retina, and the degree of divergence of the divergent light beam can be improved. As a result, the effect of suppressing the progression of myopia can be enhanced while maintaining the wearing feeling of the spectacle lens.

<Preferred Examples and Modifications of Spectacle Lenses> A preferred example and a modified example of the spectacle lens of one aspect of the present invention are described below.

As the plan view shape of the convex region, although a circular region has been exemplified, the present invention is not limited to this, and it may be an elliptical region. Other shapes of regions (eg, rectangles) are also possible, but such shapes may cause unexpected aberrations or stray light, so a circular region or an elliptical region is preferred.

When the refractive power is increased in the direction from the central portion to the peripheral portion, the refractive power can be increased from the top-view center of the convex region to the peripheral portion (root), or at a place other than the center (that is, a predetermined distance away from the center). place) to increase the refractive power. Again, the form of increase may be purely incremental or not. The amount of increase of the refractive power is not limited, and for example, it may be in the range of 1.0 to 8.0 D, and the refractive power may be increased to 1.1 to 3.0 times the refractive power of the central portion.

It can be said that increasing the refractive power in the direction from the central portion toward the peripheral portion increases the additional amount of positive spherical aberration as the direction proceeds. From this viewpoint, the following constitutions are preferably employed.

The light emitted from the spectacle lens through the convex region is preferably in the same state as the light passing through a virtual lens obtained by adding positive spherical aberration to a spherical lens having the same focal distance as the central portion of the convex region. become.

According to the spectacle lens of one aspect of the present invention, the divergence of the divergent light beam incident on the retina at position A can be increased, thereby increasing the variation of the spot size (or light intensity) of a given eyeball accommodation amount. From this viewpoint, the following constitutions are preferably employed.

As the maximum light intensity density of the light spot when the divergent light is incident on the position A, it is preferable that the light intensity density is higher at the position closer to the object side than the position A compared to the position A. This means that the light beam passing through the convex region is diverging light.

The refractive power of the central portion of the convex region is not limited. The refractive power of the central portion of the convex region may be the same as that of the base region, but is preferably greater than that of the base region. Furthermore, when the convex region as a whole is an aspherical curved surface, it is preferable that the refractive power at the center of the convex region (the average of the minimum refractive power and the maximum refractive power) is greater than the refractive power of the base region.

If the refractive power is increased in the direction from the central portion toward the peripheral portion based on this configuration, since the refractive power of the central portion is originally set relatively high, the refractive power of the peripheral portion can be further increased. As a result, δ _0max can be increased, and the height h ₁ can be increased, so that the divergence of the diverging beam can be improved.

The range in which the refractive power increases in the direction from the central portion toward the peripheral portion may be the entire convex region or only a part of the convex region. When it is only a part of the convex region, it may be a peripheral part surrounding the central part of the convex region, or only a part of the peripheral part. For example, the refracting power may be increased in the peripheral portion of the annular shape to just before the root of the convex region. On the other hand, the refracting power may be fixed or reduced in the peripheral portion of the annular ring near the root.

In short, as long as the refractive power increases in the direction from the central portion to the peripheral portion in at least a part of the convex region, δ _0max can be increased, and the height h ₁ can be increased, thereby improving the divergence of the diverging beam. _{However, when the refractive power is increased in the entire peripheral portion, δ 0max is} naturally easily increased compared with the case where the refractive power is increased only in a part of the peripheral portion, which is preferable. In the case where the refractive power is increased in the entire peripheral portion, the boundary between the peripheral portion and the base region is defined as a portion where the power starts to change from the base region.

The three-dimensional shape of the convex region is not limited as long as it adopts an aspherical shape that increases the refractive power at least at the root. More specifically, the three-dimensional shape of the convex region is not limited as long as a situation in which the diverging wavefront can be incident on the retina can be generated. The convex region may be constituted by a curved surface as in one aspect of the present invention, or may be constituted by a discontinuous surface other than the curved surface.

For example, the central part of the convex region may be formed into a spherical shape, and the other parts may be formed into an aspherical curved surface shape. In this case, the portion from the spherical shape to the aspherical curved surface shape becomes the boundary between the central portion and the peripheral portion.

Of course, it is also possible to make the entire convex region an aspherical curved surface shape. When the entire convex region is made into an aspherical curved surface shape, the boundary between the central portion and the peripheral portion may be provided in a portion of 1/3 to 2/3 of the plan view radius.

However, the present invention is not limited to the above-mentioned shapes. The reason for this will be described below.

The situation in which the diverging wave surface can be incident on the retina is not limited to the convex region of the spherical surface, but may also exist in the convex region of various surface shapes. As long as the surface with the best myopia suppression effect can be designed. However, for this purpose, an appropriate evaluation method of the effect of suppressing the progression of myopia is required.

[數式3]

As a method for evaluating the effect of suppressing the progression of myopia, it is possible to consider setting the rate of change of the spot area or radius on the retina with respect to the change in the adjustment amount, and/or the change in the (average or maximum) light intensity density of the spot on the retina with respect to the adjustment amount. rate of change. According to [Equation 1] listed in the means column of the present invention, the diameter R _PSF of the spot on the retina and the area S _PSF of the spot on the retina can be obtained as follows. [Equation 2]

[Equation 3]

。Furthermore, PSF refers to a point spread function (Point Spread Function), which is a parameter obtained by using a ray tracing method. The PSF is obtained by tracing a number of rays emitted from a point light source and calculating the luminous intensity of the light spot on any surface. Then, the PSFs of the plurality of arbitrary surfaces are compared, and among the plurality of arbitrary surfaces, the position (surface) where the light rays converge the most is determined. Furthermore, the diameter of the light ray only needs to be set based on the pupil diameter, for example, it can also be set to 4 mm.

.

[數式5]

When observing an object, the refractive power of the human eye is not fixed, but constantly adjusts and moves to find the best focus position. The size of the light spot in the convex area also changes according to the adjustment fretting. For example, if the eyeball is adjusted so that the refractive power of the optical system synthesized by the spectacle lens and the eyeball becomes a _{value obtained by adding P eye} and the refractive power A of the adjustment amount, then [Equation 2] [Equation 3] is As shown in the following [Expression 4] [Expression 5]. [Equation 4]

[Equation 5]

Regarding the rate of change of the radius of the light spot, the derivative of [Expression 4] can be obtained, and after substituting A=0, it can be obtained by the following equation. [Equation 6]

Regarding the rate of change of the area of the light spot, the derivative of [Expression 5] can be obtained, and after substituting it into A=0, it can be obtained by the following equation. [Equation 7]

The formula about the above area is the formula when the light spot formed by the convex region is circular. According to the shape of the convex region, the light spot may also be distributed in a ring shape or other shapes. In this case, the formula can only be set according to the shape of the light spot. The formula of the light intensity density can also be individually set according to the shape design of the convex region.

According to the design of each shape, the maximum declination angle δ _{0max is} different, and the size of the light spot on the retina and the distribution of light intensity are also different. There are also various opinions about the optical density. In the case of Patent Document 1, when the shape of the minute protrusions is spherical and aberrations are not considered, the light spot on the retina is circular and the light intensity is uniformly distributed, so the light intensity density can be easily calculated. Compared with the case of Patent Document 1, the convex regions of other surface shapes may have a change in the shape of the spot on the retina, and the amount of light may become unevenly distributed. On the other hand, the rate of change of the spot area with respect to the adjustment can be directly obtained. Further, regarding the light intensity density, for example, the average light intensity density of the entire light spot, the maximum light intensity density in the light spot, etc. may be obtained, and the rate of change relative to the adjustment may be used as an evaluation index of the effect of suppressing myopia progression.

If the above-mentioned evaluation method for the effect of suppressing the progression of myopia is adopted, a surface with the best effect of suppressing myopia can be designed. This means that the effect of suppressing the progression of myopia at this time can be appropriately evaluated based on the use of convex regions of various surface shapes. As a result, the surface shape of the convex region is no longer limited.

In addition, when a situation in which a diverging wave surface is incident on the retina occurs, the number or arrangement of the convex regions arranged within the range of the pupil diameter is not limited. The reason for this will be described below.

2 is a diagram showing the incident light beam from an object at infinity passing through a plurality of convex regions of the spectacle lens of one aspect of the present invention when the eyeglass lens and the eyeball are combined as an optical system. A schematic side view of the incident on the retina.

As shown in FIG. 2 , when a plurality of convex regions are arranged within the range of the pupil diameter, light spots of limited size are respectively formed on the retina. When each convex area is arranged along the surface of the spectacle lens, the ridge will not be formed as a whole, and the chief ray passing through the arrangement position is consistent with the light at the corresponding position of the spectacle lens when there is no convex area, and converges. into an image on the retina.

Therefore, in this case, the center positions of the light spots of all the convex regions are the same, and no double image can be seen. Also, if the surface shapes of all the convex regions are the same, the light spot overlaps the retina completely and uniformly. With the addition of the refractive power A for adjustment, the centers of the light spots are offset and overlapped along the chief rays. The offset is proportional to the spacing between the convex regions.

It is only necessary to calculate the size of the light spots formed by the addition of the light spots of all the convex areas while offsetting, the rate of change of the area due to adjustment, and/or the average or maximum value of the light intensity density. What is necessary is just to evaluate the myopia suppression effect.

<A specific example of eyeglass lenses> The configuration of the plurality of convex regions is not particularly limited. For example, it can be determined from the viewpoints of visibility from outside the convex regions, designability imparted by the convex regions, and adjustment of refractive power by the convex regions. Decide.

Around the center of the lens, substantially circular convex regions may be arranged in the shape of islands at equal intervals in the circumferential and radial directions (ie, in a state where they are not adjacent to each other but separated from each other). As an example of the arrangement of the convex regions in a plan view, the centers of the convex regions are separately arranged so as to be vertices of an equilateral triangle (the centers of the convex regions are arranged at the vertices of the honeycomb structure).

However, one aspect of the present invention is not limited to what is described in Patent Document 1. That is, the convex regions are not limited to a state in which the convex regions are not adjacent to each other but are separated from each other, and they may be in contact with each other, and a non-independent arrangement may be adopted so as to be connected in a series.

Each convex region can be configured as follows, for example. The diameter of the convex region is preferably about 0.6 to 2.0 mm. The protrusion height (protrusion amount) of the convex region is about 0.1 to 10 μm, preferably about 0.7 to 0.9 μm. The refractive power of the central portion of the convex region is preferably set to be greater than the refractive power of the region where the convex region is not formed, and the difference is about 2.00 to 5.00 diopters. The portion of the peripheral portion of the convex region having the largest refractive power is preferably set to be larger than the refractive power of the region where the convex region is not formed, and the difference is about 3.50 to 20 diopters.

The lens base material may be formed of, for example, a thermosetting resin material such as thiourethane, allyl resin, acrylic resin, and episulfide resin. Furthermore, as the resin material constituting the lens base material, other resin materials that can obtain a desired refractive index can also be selected. Moreover, instead of a resin material, the lens base material made of inorganic glass may be used.

The hard coat film can be formed using, for example, a thermoplastic resin or an ultraviolet (UV, Ultraviolet) curable resin. The hard coat film can be formed by using a method of dipping a lens base material in a hard coat solution, spin coating, or the like. By covering with such a hard coat film, the durability of the spectacle lens can be improved.

The antireflection film can be formed by forming an antireflection agent _{such as ZrO 2} , MgF ₂ , and Al ₂ O _{3 into a film by vacuum evaporation.} By covering the anti-reflection film, the visibility of the image through the spectacle lens can be improved.

As described above, a plurality of convex regions are formed on the object side surface of the lens base material. Therefore, when the surface is covered with the hard coat film and the anti-reflection film, a plurality of convex areas are also formed by the hard coat film and the anti-reflection film, following the convex areas in the lens base material.

When manufacturing an spectacle lens, first, a lens base material is formed by a known molding method such as casting molding polymerization. For example, a lens base material having a convex region on at least one surface is obtained by performing molding by casting polymerization using a molding die having a molding surface provided with a plurality of concave portions. Then, after the lens base material is obtained, a hard coating film is formed on the surface of the lens base material. The hard coat film can be formed by using a method of dipping a lens base material in a hard coat solution, spin coating, or the like. After the hard coating film is formed, an antireflection film is further formed on the surface of the hard coating film. The hard coat film can be formed by forming an antireflection agent into a film by vacuum deposition. According to the manufacturing method in this order, the spectacle lens having a plurality of convex regions protruding toward the object side on the surface on the object side can be obtained.

The film thickness of the film formed by the above-mentioned steps may be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, and more preferably 1.0 to 3.0 μm). However, the film thickness of the film is determined according to the function required by the film, and is not limited to the illustrated range.

On the film, more than one film may be further formed. As an example of such a film, various films, such as an antireflection film, a water-repellent or hydrophilic antifouling film, and an antifogging film, are mentioned. A known technique can be applied to the formation method of these films. [Example]

Next, an Example is shown and this invention is demonstrated concretely. Of course, the present invention is not limited to the following examples.

<Example 1> Make the following spectacle lenses. Furthermore, the spectacle lens only includes the lens base material, and other substances are not laminated on the lens base material. S (spherical power) as the prescription power of the prescription is set to 0.00 D, and C (astigmatism power) is set to 0.00 D. •Diameter of the lens substrate when viewed from above: 100 mm •Type of lens base material: PC (polycarbonate) • Refractive index of lens base material: 1.589 • Refractive power of the base area of the lens substrate: 0.00 D • Formation surface of the convex region: the surface on the object side • The range where the convex area is formed: within a circle with a radius of 20 mm from the center of the lens (excluding the area of a regular hexagon whose inscribed circle is a circle with a radius of 3.8 mm from the center of the lens) •The shape of the convex area when viewed from above: perfect circle (diameter 1.2 mm) • Diameter of the central part of the convex area: 0.3 mm • Refractive power at the center of the convex area: same as that of the base area • Deflection angle at the root of the convex area (near the junction with the base area): 7.22 points (equivalent to a refractive power of 3.5 D when the convex area is spherical). Furthermore, the refractive power P corresponding to the deflection angle can be obtained by using P=dδ/dr [δ unit is radian (however, the unit may be omitted in the following; it is expressed in minutes in the figure)]. • Arrangement of the convex regions in plan view: The centers of the convex regions are arranged independently of each other so as to be the vertices of an equilateral triangle (the centers of the convex regions are arranged at the vertices of the honeycomb structure) • Distance between convex areas (distance between centers of convex areas): 1.4 mm • Number of convex areas within pupil diameter: 7 Furthermore, the paraxial approximation is used in the PSF here, so the eyeball model is not used. Hereinafter, the above-mentioned conditions are adopted unless otherwise specified. However, the present invention is not limited to the above-mentioned conditions.

FIG. 3( a ) is a schematic plan view showing the case where the convex regions within the pupil diameter are separated and arranged in a honeycomb structure, and FIG. 3( b ) is a schematic plan view obtained by enlarging the three convex regions. FIG. 4 is a diagram of Example 1 when the radial position [mm] from the center of the convex region is taken as the X axis, and the deflection angle δ [min] is taken as the Y axis. FIG. 5 is a diagram of Example 1 when the radial position [mm] from the center of the convex region is the X axis, and the cross-sectional power P[D] is the Y axis. FIG. 6 is a view of Example 1 when the viewing angle [minutes] is set on the X axis, and the value of PSF (light intensity) is set on the Y axis.

The angle of view is the line connecting the point of the object beyond the line of gaze to the entrance pupil of the eye and the angle of the line of gaze. The image of the object on the retina and the distance from the central pit on the retina are proportional to the viewing angle. Therefore, the horizontal axis of the PSF is often set to the viewing angle instead of the position on the retina.

。 圖5所示之圖係剖面功率。其係偏角曲線之斜率(導數)，由以下之[數式9]表示。 [數式9]

[數式8][數式9]表示折射力自中央部與周邊部之交界朝向周邊部與基底區域之交界增加。交界部(r＝0.6 mm)之功率為9.33 D。The graph shown in Figure 4 is a declination curve. In Example 1, the central portion of the convex region and the base region have the same refractive power, which is 0.00 D. In the central portion, that is, the region with a diameter of 0.3 mm, the slope of the declination curve is zero. On the other hand, in the region with a radius of 0.3 mm or more, the off-angle gradually increases and reaches δ _0max at the junction with the base region. This function is represented by the following [Expression 8]. [Equation 8]

. The graph shown in Figure 5 is the cross-sectional power. It is the slope (derivative) of the declination curve and is represented by the following [Expression 9]. [Equation 9]

[Expression 8] [Expression 9] indicates that the refractive power increases from the boundary between the central portion and the peripheral portion toward the boundary between the peripheral portion and the base region. The power at the junction (r=0.6 mm) was 9.33 D.

As shown in FIG. 6 , in the viewing angle range of 14.44/14, the light intensity density is very high when the viewing angle is zero. The light intensity density when the viewing angle is zero is formed by the light beam at the center of the convex region with a diameter of 0.3 mm. This area realizes the prescription prescription together with the base area other than the convex area, and forms an image at the position A on the retina.

<Example 2> Spectacle lenses different from those of Example 1 in the following points were produced. It is the same as Example 1 except for the following points. • Diameter of the central part of the convex area: 0.6 mm • Refractive power at the center of the convex area: Refractive power of the base area +2.50 D

FIG. 7 is a diagram of Example 2 when the radial position [mm] from the center of the convex region is the X axis, and the declination angle δ [min] is the Y axis. FIG. 8 is a diagram of Example 2 when the radial position [mm] from the center of the convex region is the X axis, and the cross-sectional power P[D] is the Y axis. FIG. 9 is a diagram of Example 2 when the viewing angle [min] is taken as the X axis, and the value of the PSF (light intensity) is taken as the Y axis.

[數式11]

[數式10][數式11]示出了折射力自中央部與周邊部之交界朝向周邊部與基底區域之交界增加。交界部(r＝0.6 mm)之功率為8.72 D。As shown in FIGS. 7 and 8 , in Example 2, the central portion of the convex region was set to the refractive power of the base region +2.50 D, and the slope increased at the peripheral portion. The variation function of the declination angle and the variation function of the profile power are respectively represented by the following [Expression 10] and [Expression 11]. [Equation 10]

[Equation 11]

[Expression 10] [Expression 11] shows that the refractive power increases from the boundary between the central portion and the peripheral portion toward the boundary between the peripheral portion and the base region. The power at the junction (r=0.6 mm) was 8.72 D.

As shown in FIG. 9 , in the viewing angle range of 14.44/44, the light intensity density is uniformly distributed in the 5.16/16 range of the central part, and the light intensity density of the outer part decreases slightly. By setting the convex area as an aspheric surface whose refractive power increases from the center to the periphery, the light in the periphery is dispersed to a large extent, so that the light spot becomes larger, and the size of the light spot changes greatly when adjusting the micro-movement, which can suppress the deepening of myopia. Effect.

Furthermore, when comparing Example 1 with Example 2, the central portion of the convex region in Example 1 has the same degree of power as the base region, which does not have the function of suppressing the progression of myopia, and the other parts can play a role in suppressing the progression of myopia. On the other hand, in Example 2, the entire convex region can exert the function of suppressing the progression of myopia.

<Example 3> Spectacle lenses different from Example 1 in the following points were produced. It is the same as Example 1 except for the following points. • The shape of the convex area in plan view: perfect circle (diameter 0.7 mm) • The diameter of the central part of the convex area: 0.2 mm • The off-angle δ _0max at the root of the convex area (near the junction with the base area): 7.22 points (when the convex area is spherical, equivalent to refractive power +6.00 D) • Distance between convex areas (distance between centers of convex areas): 0.825 mm • Convex within the pupil diameter Number of areas: 19

FIG. 10( a ) is a schematic plan view showing the case where the convex regions are separated and arranged in a honeycomb structure within the pupil diameter, and FIG. 10( b ) is a schematic plan view obtained by enlarging three convex regions. Fig. 11 is a view of Example 3 when the radial position [mm] from the center of the convex region is the X axis, and the deflection angle δ [min] is the Y axis. FIG. 12 is a diagram of Example 3 when the radial position [mm] from the center of the convex region is the X axis, and the cross-sectional power P[D] is the Y axis. FIG. 13 is a diagram of Example 3 when the viewing angle [min] is represented on the X axis, and the value of PSF (light intensity) is represented on the Y axis.

[數式13]

交界部(r＝0.6 mm)之功率為16.8 D。As shown in FIGS. 11 and 12 , in Example 3, the central portion of the convex region is set as the refractive power (zero) of the base region, and the slope increases outside the central portion. The variation function of the declination angle and the variation function of the profile power are respectively represented by the following [Expression 12] and [Expression 13]. [Equation 12]

[Equation 13]

The power at the junction (r=0.6 mm) was 16.8 D.

As shown in FIG. 13 , in the viewing angle range of 14.44/44, the light intensity density when the viewing angle is zero is very high, and the spectacle lens of Example 3 can visually recognize objects well. At the same time, as shown in FIG. 10 , even in the portion where the absolute value of the viewing angle is large, the light quantity density increases. This is the light amount density due to divergent light. The effect of myopia progression can be suppressed by securing the light quantity density within the viewing angle other than the viewing angle zero. In Embodiment 3, since the convex area is small and the interval is narrow, most of the convex areas enter into the pupil, so the shaking caused by the movement of the line of sight is less, and the wearing feeling of the glasses is better.

<Example 4> • Shape of the convex region in plan view: perfect circle (diameter 0.7 mm) • Diameter of the central part of the convex region: 0.2 mm • At the root of the convex region (near the boundary with the base region) Declination δ _0max : 7.22 minutes (when the convex area is spherical, it is equivalent to the refractive power +6.00 D) • The distance between the convex areas (the distance between the centers of the convex areas): 0.825 mm • Pupil Number of convex areas within the diameter: 19

FIG. 14 is a diagram of Example 4 when the radial position [mm] from the center of the convex region is the X axis, and the deflection angle δ [min] is the Y axis. Fig. 15 is a diagram of Example 4 when the radial position [mm] from the center of the convex region is taken as the X axis, and the cross-sectional power P[D] is taken as the Y axis. FIG. 16 is a diagram of Example 4 when the viewing angle [min] is taken as the X axis, and the PSF value (light intensity density) is taken as the Y axis.

[數式15]

交界部(r＝0.6 mm)之功率為9.5 D。As shown in FIGS. 14 and 15 , in Example 4, the slope continued to increase from the center of the convex region toward the periphery. The change function of the declination angle and the change function of the profile power are respectively represented by the following [Expression 14] and [Expression 15]. [Equation 14]

[Equation 15]

The power at the junction (r=0.6 mm) was 9.5 D.

As shown in FIG. 16 , in the viewing angle interval of 14.44/14, the light quantity density (PSF) decreases from the center toward the periphery. The effect of myopia progression can be suppressed by securing the light intensity in a wide viewing angle range. In Embodiment 4, since the convex area is small and the interval is narrow, most of the convex areas enter into the pupil, so there is less shaking caused by the movement of the line of sight, and the wearing feeling of the glasses is better.

The PSF calculation of the above embodiment treats the glasses and the eyeball model as an ideal optical system, and the light rays are all calculated according to the paraxial approximation. The actual optical system of the eyeball has aberrations, and the situation is more complicated, but the basic relationship, such as the direction of change in size caused by adjusting the micro-motion when the divergent light is incident on the retina, does not change much.

FIG. 17 is an explanatory diagram of PSF calculation. Specifically, FIG. 17( a ) is used to explain that when the radial position r from the center of the entrance pupil (ie, the center on the spectacle lens) is the X axis and the declination angle δ is the Y axis, δ increases with respect to r And monotonically increasing graph. FIGS. 17( b ) and 17( c ) are diagrams for deriving the relationship between the light quantity density incident on the convex region and the light quantity density of the light spot on the retina.

In Figure 17(b), assuming that the light intensity density of the uniformly distributed light intensity of the entrance pupil (convex region) is e, the area of the annular region in the dr range at the position r is 2πrdr, and the light intensity in this region is 2πredr. In Fig. 17(c), in the declination coordinate system at position r, the area of the ring in the range of dδ at position δ is 2πδdδ, so the light density is (2πredr)/(2πδdδ)=e×r/(δ( dδ/dr)). As a result, the PSF is represented by the following equation. [Equation 16]

Fig. 1 is a schematic side showing the case where the incident light beam from an object at infinity is incident on the retina through a convex region of the spectacle lens when the eyeglass lens and the eyeball are combined as one optical system view. 2 is a diagram showing the incident light beam from an object at infinity passing through each of a plurality of convex regions of the spectacle lens of one aspect of the present invention when the eyeglass lens and the eyeball are combined as an optical system A schematic side view of the incident on the retina. FIG. 3( a ) is a schematic plan view showing the case where the convex regions within the pupil diameter are separated and arranged in a honeycomb structure, and FIG. 3( b ) is a schematic plan view obtained by enlarging the three convex regions. FIG. 4 is a diagram of Example 1 when the radial position [mm] from the center of the convex region is taken as the X axis, and the deflection angle δ [min] is taken as the Y axis. FIG. 5 is a diagram of Example 1 when the radial position [mm] from the center of the convex region is the X axis, and the cross-sectional power P[D] is the Y axis. FIG. 6 is a diagram of Example 1 when the viewing angle [minutes] is set on the X-axis and the value (light intensity) of the Point Spread Function (PSF) is set on the Y-axis. FIG. 7 is a diagram of Example 2 when the radial position [mm] from the center of the convex region is the X axis, and the declination angle δ [min] is the Y axis. FIG. 8 is a diagram of Example 2 when the radial position [mm] from the center of the convex region is the X axis, and the cross-sectional power P[D] is the Y axis. FIG. 9 is a diagram of Example 2 when the viewing angle [min] is taken as the X axis, and the value of the PSF (light intensity) is taken as the Y axis. FIG. 10( a ) is a schematic plan view showing the case where the convex regions within the pupil diameter are separated and arranged in a honeycomb structure, and FIG. 10( b ) is a schematic plan view obtained by enlarging three convex regions. Fig. 11 is a view of Example 3 when the radial position [mm] from the center of the convex region is the X axis, and the deflection angle δ [min] is the Y axis. Fig. 12 is a diagram of Example 3 when the radial position [mm] from the center of the convex region is taken as the X axis, and the cross-sectional power P[D] is taken as the Y axis. FIG. 13 is a diagram of Example 3 when the viewing angle [minutes] is on the X axis, and the value of PSF (light intensity) is on the Y axis. FIG. 14 is a diagram of Example 4 when the radial position [mm] from the center of the convex region is the X-axis, and the declination angle δ [min] is the Y-axis. FIG. 15 is a diagram of Example 4 when the radial position [mm] from the center of the convex region is the X axis, and the cross-sectional power P[D] is the Y axis. FIG. 16 is a diagram of Example 4 when the viewing angle [minutes] is on the X axis, and the value of PSF (light intensity) is on the Y axis. 17(a) to (c) are explanatory diagrams of PSF calculation.

Claims (5)

A spectacle lens with: The basal region, which causes light beams incident from the surface on the object side to exit from the surface on the eyeball side and converge through the eye at position A on the retina; and a plurality of defocused regions, which are in contact with the above-mentioned base region, and have the property of making the light beam passing through at least a part of the above-mentioned defocused regions incident on the position A as divergent light; and In at least a part of the above-mentioned defocused area, the refractive power increases in the direction from the central portion toward the peripheral portion. The spectacle lens of claim 1, wherein the light passing through the defocus region and emitted from the spectacle lens is in the same state as the light passing through a virtual lens having the same focal point as the central portion of the defocus region The distance spherical lens is formed by adding positive spherical aberration. The spectacle lens of claim 1, wherein the maximum light intensity density of the light spot when incident on the position A as the divergent light is larger than the position A at the position closer to the object side than the position A. The spectacle lens of claim 1, wherein the refractive power of the central portion of the defocus region is greater than the refractive power of the base region. The spectacle lens according to any one of claims 1 to 4, wherein the spectacle lens is a lens that suppresses progression of myopia.

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